\documentclass[a4paper]{article}
\usepackage[british, english, frenchb]{babel}

\newcommand\activatelanguage[2]{%
  \selectlanguage{#1}}

\newcommand\test[2]{%
  \wlog{#1: #2}%
  \showhyphens{#1}}

\begin{document}
\input{common-02}
\end{document}
